The group released a teaser photo the same day and the concept is twins.

On april 17, they released teaser photos for their comeback.

A teaser photo for their comeback was released a few days later on the 28th.

Starting on October 28, the group uploaded some teaser photos onto their official website.

A teaser photo with the concept of the song was released in October 18.

Several teaser photos were released on this day as well.

SM stated that new teaser photos would be released from the 17th and on.

Another teaser photo was revealed on January 10 with more details about the title track.

On March 2, a teaser photo of the member Erin was revealed.

A teaser photo with the concept of the song was released in August 4.